#include "Mystdio.h"
#include <unistd.h>
#define myfile "test.txt"

int main()
{
    _FILE *fp= _fopen(myfile,"a");
    if(fp==NULL) return 1;

    const char *msg = "hello world\n";
    int cnt = 10;    
    while(cnt)
    {
    _fwrite(fp,msg,strlen(msg));
    //fflush(fp);

    sleep(5);
    cnt--;

    }
    _fclose(fp);

    return 0;
}

